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Lefties make up about 10 percent of the population.  More

Pregnancy Week 18

In week 18, your baby's ears reach their final position on the sides of the head.

Nerve endings from your baby's brain make their connection to the bones of the middle ear, allowing your baby to hear internal sounds such as your heart beating.

By the end of this week, your baby will be about 5.5 inches or 140 millimeters in length from crown to rump and weigh almost 7 ounces or 200 grams.

Second trimester symptoms are still common at this time.